- X-Files, The
Unix Power Tools, Third Edition, Unix in a Nutshell, Fourth Edition, Learning the bash Shell (In a Nutshell (O'Reilly)), A Practical Guide to UNIX(R) for Mac OS(R) X Users, Practical Unix & Internet Security, 3rd Edition, X Toolkit Intrinsics Ref Man R5 (Definitive Guides to the X Window System), HP-UX 11.x System Administration "How To" Book (2nd Edition), The X Window System: Programming and Applications with XT, OSF/Motif, Excel X for Mac OS X, Volume 6b: Motif Reference Manual, 2nd Edition (Motif Reference Manual)
- X-Men
New X-Men Omnibus, Astonishing X-Men Vol. 3: Torn, X-Men: The Complete Age of Apocalypse Epic, Book 1, House of M (X-Men New Avengers), X-Men: The Complete Age of Apocalypse Epic, Book 4, Astonishing X-Men Vol. 2: Dangerous, X-Men: The Complete Age of Apocalypse Epic, Book 3, Astonishing X-Men Vol. 1: Gifted, Ultimate X-Men, Vol. 2, X-Men: The Complete Age of Apocalypse Epic, Book 2
- Xanadu
Orson Welles: Volume 1: The Road to Xanadu, In Xanadu: A Quest, Suburban Xanadu: The Casino Resort on the Las Vegas Strip and Beyond, How to Get Paid $50,000 a Year to Travel* *Without Selling Anything: Xanadu System, Sources, Meaning and Influences of Coleridge's Kubla Khan: Xanadu Re-Routed (Studies in British Literature), In Xanadu, Way To Xanadu, The, Far from Xanadu, The Xanadu Talisman: Modesty Blaise, Marco Polo: From Venice to Xanadu
- Xanth
Source of Magic (Xanth Novels), Stork Naked (Xanth), Pet Peeve (Xanth), A Spell for Chameleon (Xanth Novels), Ogre, Ogre (Xanth Novels), Geis of the Gargoyle (Xanth), Night Mare (Xanth Novels), Swell Foop (Xanth), Xanth 13: Isle of View (Magic of Xanth), Centaur Aisle (Xanth Novels)
- Xeelee Sequence
Vacuum Diagrams: Stories of the Xeelee Sequence, Vacuum Diagrams: Stories of the Xeelee Sequence
- Xena: Warrior Princess
All I Need To Know I Learned From Xena: Warrior Princess, Xena: Warrior Princess, Xena Warrior Princess: Complete Illustrated Companion, How the Quest Was Won: A Novel (Xena, Warrior Princess), Xena: The Huntress and the Sphinx (Xena, Warrior Princess), Xena: Warrior Princess: Prima's Official Strategy Guide, Xena: The Thief of Hermes (Xena, Warrior Princess), Xena: Prophecy of Darkness (Xena, Warrior Princess), Lucy Lawless, Warrior Princess!, Life Lessons from Xena, Warrior Princess: A Guide to Happiness, Success, and Body Armor
- Xenogenesis
Dawn (Xenogenesis), Imago (Book Three of the Xenogenesis Series), Xenogenesis: Dawn / Adulthood Rites / Imago, Adulthood Rites (Xenogenesis), Xenogenesis: Dawn ; adulthood rites ; imago, Adulthood Rites: Xenogenesis (Butler, Octavia//Xenogenesis), Xenogenesis: Dawn, Adulthood Rites, Imago, Xenogenesis, XENOGENESIS, Xenogenesis